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| author | Jesper Dangaard Brouer <[email protected]> | 2021-04-30 06:01:51 +0000 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2021-04-30 18:20:43 +0000 |
| commit | ce76f9a1d9a21c2633dcd2a5605f923286e16e1d (patch) | |
| tree | ac88cdbe2dcb1b12d204bbe2fb0401d98b61d81b /fs/ext4/fast_commit.c | |
| parent | mm/page_alloc: add an array-based interface to the bulk page allocator (diff) | |
| download | kernel-ce76f9a1d9a21c2633dcd2a5605f923286e16e1d.tar.gz kernel-ce76f9a1d9a21c2633dcd2a5605f923286e16e1d.zip | |
mm/page_alloc: optimize code layout for __alloc_pages_bulk
Looking at perf-report and ASM-code for __alloc_pages_bulk() it is clear
that the code activated is suboptimal. The compiler guesses wrong and
places unlikely code at the beginning. Due to the use of WARN_ON_ONCE()
macro the UD2 asm instruction is added to the code, which confuse the
I-cache prefetcher in the CPU.
[[email protected]: minor changes and rebasing]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Jesper Dangaard Brouer <[email protected]>
Signed-off-by: Mel Gorman <[email protected]>
Reviewed-by: Alexander Lobakin <[email protected]>
Acked-By: Vlastimil Babka <[email protected]>
Cc: Alexander Duyck <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Chuck Lever <[email protected]>
Cc: David Miller <[email protected]>
Cc: Ilias Apalodimas <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'fs/ext4/fast_commit.c')
0 files changed, 0 insertions, 0 deletions